Implement metrics, describe system table tests

[tbantle22]

GMS PR: dolthub/go-mysql-server#2800

[github-actions]

	Main	PR
covering_index_scan_postgres	365.51/s	341.10/s	-6.7%
index_join_postgres	152.83/s	152.80/s	-0.1%
index_join_scan_postgres	183.98/s	183.10/s	-0.5%
index_scan_postgres	12.55/s	12.45/s	-0.8%
oltp_point_select	2763.17/s	2742.84/s	-0.8%
oltp_read_only	1842.48/s	1857.46/s	+0.8%
select_random_points	111.71/s	110.73/s	-0.9%
select_random_ranges	130.43/s	133.23/s	+2.1%
table_scan_postgres	11.84/s	11.82/s	-0.2%
types_table_scan_postgres	5.64/s	5.60/s	-0.8%

[zachmu]

LGTM

[github-actions]

	Main	PR
Total	42090	42090
Successful	15350	15351
Failures	26740	26739
Partial Successes1	5233	5234

	Main	PR
Successful	36.4695%	36.4718%
Failures	63.5305%	63.5282%

${\color{lightgreen}Progressions (1)}$

window

QUERY: SELECT rank() OVER (ORDER BY rank() OVER (ORDER BY random()));

Footnotes

1. These are tests that we're marking as Successful, however they do not match the expected output in some way. This is due to small differences, such as different wording on the error messages, or the column names being incorrect while the data itself is correct. ↩